Blade-clamp for saw-frames.



R. GOPFRON.

BLADE CLAMP r0 SAW FRAMES.

APPLICATION FILED JAN. 23,1911.

Patented May 2, 1911.

e f from RUTHERFORD COIFBON, 0! WASHINGTON, DISTRICT OF COLUMBIA,ASSIGNOB O1 ONE-HALF TO ARTHUR GOWSILL, OF W ASHINGTON, DISTRICT OFCOLUMBIA.

BLADE-CLAMP FOB SLW -FRAKES.

Specification of Letters intent.

Patented May 2, 1911.

Application filed January 23, 1911. Serial No. 604,185.

in c

% his invention relates to improved means for rigidly holding a sawblade in its frame and more particularly to .a new and novel devicewhereby asection of a broken blade may be utilized in cases ofemergency.

The invention has for a further object the provisionof an adjustablegriipping device arranged upon the. handle 0 the saw, said comprising atubular member and flexible metal strips having gripping jaws formed onone of their ends and threaded to receive an adjusting nut whichIEengages with the ends of said tubular mem- Still another objectof theinvention is to rovide means for preventing the jaw memrs from turningor rotating in the tubular member during the operation of the saw.Another object of the invention resides in the provision of means forrigidly holdin a section of a broken saw b ade in the ad ustable frameof aback-saw, said device I being very quickly adjustable to secure orrelease the saw blade and extremely efiicient,- reliable and durable inuse.

With the above andother objects in view, the invention consists'of thenovel features of construction, combination and arrangement of partshereinafter fully described and claimed, and illustratedv in theaccompanying drawing, in which- Figure 1 is a side elevation artly insection illustrating my improved blade holding device; Fig. 2 is asection'taken on the line 2-2 of Fig. 1; Fig. 3 is a section taken ontheline 33 of Fig. 1; Fig. 4 is a section taken on the line 4--4 of Fig.1; and

. Fig. 5 is a section taken on the line 5-5 of eferring .in detail tothe drawing 5 designatesthe handle of the saw in which the-frame barsections 6 is rigidly sec'uredby means of the rivets or other ana'lo ousfastening devices 7. The other frame-v ar section 6 is bent intermediateof its ends and disposed at right angles.

One of the ends of the frame section 6' is normally disposed inalinement with the rigid frame bar 6. Asubstantially U-shaped late 8 isarranged upon these sections and 18 provided in its intermediate portionwith a plurality of openings 9 to receive the studs 10 one of which isfixed in the extremit of v the frame sections 6 and 6'. It wil bereadily seen that the frame may be easily and quickly adjusted by movingthe frame bar sections in the U-shaped plate and ositioning the studs inthe openings 0 the plate 8. The lower corners of the plate 8 at each endthereof are connected by means of the rivets 11 which support the barsections in their sliding movement and prevent the entire disconnectionof the same from the plate 8. Upon the other end of theframe section 6 asleeve 12 is secured and in this sleeve a bolt 13 is slidably mounted,the head of said bolt having a lug 14: formed thereon for engagement ina recess 14 in one end of the seeve as shown in Fi 1 thus holding thebolt against rotation. %he end of the shank of said bolt is flattenedand has fixed thereto a laterally dis osed pin 15 which extends at aslight ang etoward the end of the frame.

The 'parts above described are all of common construction and in theusual form of adjustable saws, a bolt similar to the bolt 13 is alsoarran ed upon the lower end of the handle 5. he pins on these bolts areadapted to be inserted through 0 enings provided in the ends of the sawb ade n the event that the blade should be broken, it must be replacedby a new one which cannot always be conveniently obtained,

thus causing considerable loss of time. It is the object of the presentinvention to utilize one of the sections of the broken blade so that thesawin operation may be continued. To this end rovide the member 16 whichis formed with a longitudinal bore or openin 17. This member 16 isfurther provide with an exterior flan e or plate 18 which is formed withthe s oulders 19 and fits within a recess or socket 20 of similar formin the end of the handle 5 thereby preventing longitudinal movement ofthe member 16. Suitable fastenin screws 21 extend through the handle andthe plate 18. The forward end of the tubular member 16 is formed with aflared or enlarged mouth, 22 the inner wall of which col on the sawblade, and the other of said with respect to theframe' in shaped plate8.;

. 16, vand the' teeth 2 jaws having a single tooth 28' which bites theopposite edge of the saw blade as the flexible metal strips 24 are movedlongitudinally in the tubular member 16. The outwardly extendingdiverging forward end portions of the strips 24 are provided w1th long1-tudinal'teeth or corrugations 29 whlch'engage with the serrations 23 onthe inner periphery of the flaredv mouth 22 of the tubular member 16 andact to prevent any rotation of the jaw members; within said tubularmember so as to absolutely prevent any movement whatever of the sawblade of the saw.

From'the above description, taken in connection with the accompanyingdrawing it is thought that the construction and operation of thedevice'will be obvious;

Thebladeso'f hack-saws such as are com-' monly employed for sawingmetal, meat "bones or other material more often become broken owing totheir brittleness than worn out throughconstant use, and by means of myimproved device, I mm to overcome the necessity of providing an entirelynew saw blade when the one in use is accidentally broken. One portion ofthe broken blade having the aforementioned opening in its end is engagedwith the pin 15 on the bolt 13 in one end of the saw frame and the otherend of the blade portion is disposed between the grippingjaws 26 afterthe frame sections have been The operator now mani ulates thenut 25 andthe flexible metal strips 24 are moved throu h the tubular member and 28of the jaws caused to bind or gIlBllBOIl opposite edges of the blade asthe diverging portions of the strips'24 move uponthe inner periphery ofthe flared mouth 22. In this manner the broken blade section may bejeasily and securely clamped in the saw frame and the operationcontinued without undue lo ssof time which would be occasioned inprocuring anentirely new blade. w

From the foregoing it willbe seen that I have produced a device which isextremely convenient and'efiective'in practical use and will entirelyeliminate the deficiencies which glroper angle the operationproperlyadjusted 'in the U- "eas exist in devices of this character asat present constructed. The expense incident to the frequent breakage ofthe saw blades is also eliminated and owing to the wide range of adjustability of the frame in connection with my improved fastenin device,one blade may be used for an inde nite time even after ithas beenbroken. The main object of my invention however resides in the fact thatin cases of emergency where the completion of the work without delay isimperative, considerable loss of time is obviated.

Thedevice may be produced at a comparatively low cost and is alsoextremely durable in use.-

The sleeve 12 is preferably provided with a'plurality of recesses 14which receive the lug 14 on the bolt head whereby the saw blade B may beangularly adjusted in the frame at any angle, the flexible stri s 24loosened in the tubular member 16 an turn therein to dis ose" thegripping'jaws at a d or engagement with the saw a e.

While I have shown and described the preferred construction andarrangement of the various parts it willvbe understood that the deviceis susceptible of considerable modification without departing from theemential feature'or sacrificing any of the advantages thereof. 1

Having thus described the invention what is claimed is: i

1. A device of the character described comprising a tubular memberrigidly fixed to a saw handle, flexible metal strips loosely disposedthrough said member, a wing-nut for threaded engagement upon said stripsand engaged with one end of the tubular member, said strips at one oftheir ends diverging to form opposed jaws for gripping engagement uponopposite ed es of the saw blade, the ad ustment of sai wing-nuton thestrips drawin said, jaws together to securely grip the b ade betweenthem.

2; device of the character described comprising a rigidly held tubularmember having a flared mouth at one end, flexible metal threaded stripsof substantially semicircular'form disposed through said member,anadjusting nut threaded on said strips enwith one end of said tubularmember, said strips diverging beyond the flared end of said member andhaving threaded extremitiesbent to form opposed jaws, teeth formed onone of the jaws for engagement with the teeth of a saw blade disposedbetween'said jaws, and a'single tooth formed on the other jaw forgripping engagement with the opposite edge of the blade, the adjustmentof said nut on the threaded metal strips drawing said strips through thetubuthe jaws into clampment with t e saw blade.

evice of the character described lar member and movin mg enga comprisinga rigidly held tubular member outwardly flared at one end, said flaredpor tion havin serrations formed on its inner wall, flexib e metalstrips disposed through said tubular member, a portion of said stripsbeing threaded, a wing-nut engaged 'thereon and disposed against one endof said tubular member, said strips diverging beyond the flared end ofsaid member and having longitudinal teeth for engagement with theserrations in the flared end of the member, and opposed jaws formed onthe diverging ends of the strips for ipping engagement upon oppositeedges 0 the saw blade arranged between them.

4. The combination with an adjustable saw frame including a handle, of atubular member rigidly fixe in said handle flared at one end andprovided on the inner periphery 20 thereof with serrations, flexiblestrips disposedthrough said tubular member and having diverging endportions provided with longitudinal teeth for engagement'with theserrations of said member, opposed jaws formed on the extremities of thediverging ends of the strips, said jaws being bifurcated to receive asaw blade, means formed in the bases of said bifurcations for grippingengagement upon opposite edges of the blade and means arranged upon saidflexible strips and engaged with the end of said tubular member to movethe strips through said member and draw the jaws into grippingengagement with the blade.

In testimony whereof I hereunto afiix my signature in the presence oftwo witnesses.

RUTHERFORD COFFRON. \Vitnesses:

M. C. LYDDANE, G110. S. LIVINGSTON.

